** Description changed:
If epicsAtomicCmpAndSwapIntT() in callbackInit() fails for some reason
(e.g. because of bug #1932118), the callback queues never get
- initialized (and callback threads never get started). Nevertheless,
- callbackRequest() will use these uninitialized queues (and an
- uninitialized event semaphore) without checking, resulting in strange
- message from a spinLock in the uninitialized queue:
+ initialized (and callback threads never get started) and the following
+ warning is printed during iocInit:
+
+ Warning: callbackInit called again before callbackCleanup
+
+ Nevertheless, callbackRequest() will use these uninitialized queues
+ (and an uninitialized event semaphore) without checking, resulting in
+ strange message from a spinLock in the uninitialized queue:
0x132f380 (timerQueue): epicsSpinLock(0x1fda0b79): Deadlock.
Recursive lock, missed unlock or block when locked.Thread timerQueue (0x132f380) can't proceed, suspending.
A patch is attached.
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https://bugs.launchpad.net/bugs/1932120
Title:
callbackRequest potentially accesses uninitialized memory
Status in EPICS Base:
New
Bug description:
If epicsAtomicCmpAndSwapIntT() in callbackInit() fails for some reason
(e.g. because of bug #1932118), the callback queues never get
initialized (and callback threads never get started) and the following
warning is printed during iocInit:
Warning: callbackInit called again before callbackCleanup
Nevertheless, callbackRequest() will use these uninitialized queues
(and an uninitialized event semaphore) without checking, resulting in
strange message from a spinLock in the uninitialized queue:
0x132f380 (timerQueue): epicsSpinLock(0x1fda0b79): Deadlock.
Recursive lock, missed unlock or block when locked.Thread timerQueue (0x132f380) can't proceed, suspending.
A patch is attached.
To manage notifications about this bug go to:
https://bugs.launchpad.net/epics-base/+bug/1932120/+subscriptions
- References:
- [Bug 1932120] [NEW] callbackRequest potentially accesses uninitialized memory Dirk Zimoch via Core-talk
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[Bug 1932118] Re: Bug in vxWorks epicsAtomicCmpAndSwapIntT Dirk Zimoch via Core-talk
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Build failed: EPICS Base 7 base-7.0-339 AppVeyor via Core-talk
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[Bug 1932120] [NEW] callbackRequest potentially accesses uninitialized memory Dirk Zimoch via Core-talk
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[Bug 1932120] Re: callbackRequest potentially accesses uninitialized memory Andrew Johnson via Core-talk
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